Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
204	DENTAL HYGIENISTS	85	49
445	DENTAL ASSISTANTS	58	27
486	GROUNDSKEEPERS AND GARDENERS, EXCEPT FARM	864
579	PAINTERS, CONSTRUCTION AND MAINTENANCE	825	75
637	MACHINISTS	197
678	DENTAL LABORATORY AND MEDICAL APPLIANCE TECHNICIANS	35	21
833	MARINE ENGINEERS	2,632
TOTAL		4,695	173

*(1) The estimates for each occupation apply across the surveyed industries in which the agent was observed. Not all industries were surveyed, and not all agents were observed in all surveyed industries. (2) When using the estimates, standard errors associated with estimates should be considered. (3) Potential exposures to a chemical agent are categorized as actual (i.e., the surveyor observed the use of the specific agent) or tradename (i.e., the surveyor observed the use of a tradename product known to contain the specific agent). The estimates presented in the table combine both categories.